Jungkook's character could develop in the way that he becomes more empathetic towards other vampires. He realizes that they are not all monsters, just like he is not. He might start to fight for vampire rights, or at least for a more peaceful co - existence between vampires and humans. His relationships with his human friends would also change, some becoming more distant while others become closer in a different way.
One idea could be that Jungkook is bitten by an ancient vampire during a late - night encounter in a mysterious forest. He then has to struggle with his newfound thirst for blood while still trying to maintain his relationships with his friends and family. He might find himself drawn to a particular person whose blood has a special scent that both attracts and repels him.
Maybe in the fanfiction, Jungkook turns into a vampire due to an ancient curse. His transformation changes his appearance slightly, with his eyes turning a deep red when he's hungry. He starts to feel alienated from the other members as he can't participate in normal human activities like eating regular food. However, he also meets other vampires who teach him how to control his urges and he eventually finds a way to balance his vampire life with his life as a member of BTS.
The other members might be initially shocked. Jin, being the eldest, would probably try to find a way to 'cure' Jungkook. Suga would be more reserved but also worried, and might start researching about vampires. J - Hope would be the one trying to cheer Jungkook up, telling him that it's okay and they'll figure it out together. RM, as the leader, would be concerned about how this will affect the group's image and their future activities, but also about Jungkook's well - being.
Another theme is friendship. In these fanfics, the relationship between Jungkook and the other BTS members is often explored. They might have to adapt to his new vampire self, and it shows how strong their bond is.
One popular 'bts newly turned vampire jungkook fanfic' is 'Vampire Jungkook's New Beginning'. It's a really interesting story that delves into how Jungkook copes with his new vampire life within the BTS universe.
Jungkook's character can be developed by showing his internal struggle as a vampire. His anger could be a mask for his fear of not being accepted. For example, when he gets angry at a human in the fanfic for being too nosy about his vampire life, it could actually be because he's afraid of what would happen if his secret got out completely. This shows his vulnerability and adds depth to his character.
It could lead to a whole new set of adventures and challenges for Dawn. Maybe she'd have to learn to control her vampire urges while still trying to maintain her relationships with friends and family.
One common theme is the struggle with his new vampiric nature. He might be confused about his new powers and instincts. For example, he could be fighting the urge to drink blood in some stories.
In fanfiction, he could be a very curious vampire. Jungkook is known for his eagerness to learn new things in real life, and as a vampire, he might be interested in modern human culture. He could be nocturnal, of course, and have a heightened sense of hearing and sight. His loyalty to his vampire clan or to his human friends would be a strong character trait, and he might be conflicted when the two worlds collide.